有1、2、3、4个数字,能组成多少个互不相同且无重复数字的三位数?都是多少?
public class Example11 {
public static void main(String[] args) {
number();
}
public static void number() {
int count = 0;
for (int x = 1; x < 5; x++) {
for (int y = 1; y < 5; y++) {
for (int z = 1; z < 5; z++) {
if (x != y && y != z && x != z) {
int number = x * 100 + y * 10 + z;
System.out.print(number + "\t");
count++;
if (count % 10 == 0) {
System.out.println();
}
}
}
}
}
System.out.println("\n共有" + count + "个三位数");
}
}